A method suitable for the routine determination of residua) sulfur dioxide in large numbers of malt samples is described. The technique is a modification of an existing method and is rapid and simple in that it involves no distillation or nitrogen stripping. Sulfur dioxide is extracted from ground malt with a di lute solution of sodium tetrachloromercurate and a colored complex is formed with p...

Abstract—The performance of mortar subjected to high temperature and cooled in normal ambient temperature was examined in the laboratory to comply with the situation of burning & cooling of a structure. Four series of cubical (5 X 5 X 5 cm) mortar specimens were made from OPC, and partial replacement (10, 15, 20, 25 & 30%) of OPC by Rice Husk Ash (RHA) produced in the uncontrolled environment. ...

Domain decomposition techniques provide a flexible tool for the numerical approximation of partial differential equations. Here, we consider mortar techniques for quadratic finite elements in 3D with different Lagrange multiplier spaces. In particular, we focus on Lagrange multiplier spaces which yield optimal discretization schemes and a locally supported basis for the associated constrained m...

We have modified and stabilized the ruthenium surface by depositing a self-assembled monolayer (SAM) of 1-hexadecanethiol on a polycrystalline ruthenium thin film. The growth mechanism, dynamics, and stability of these monolayers were studied. SAMs, deposited under ambient conditions, on piranha-cleaned and piranha + H2SO4 cleaned substrates were compared to monolayers formed on H-radical-clean...

The study is devoted to the modification of 42.5 class ordinary Portland cement with a 10% special expanding additive (cement powder and gypsum in 40:60 percentage ratio), impact this on mortar determined. Using modified multi-fraction quartz sand ratio 1:3, prism-shaped samples size 4x4x16 cm were fabricated, left water bath for 24±2 hours after formation. After one day curing, demolded, their...

Several reactions representing important categories of catalytic systems have been studied on chemically modified single crystal surfaces. These reactions are methanation of CO and CO:. hydrogenolysis of ethane. hydrogenation of ethylene. and q&propane ring-opening and hydrogenolysis. Poisoning of the above reactions by ordered. suhmonolayer coverages of sulfur shou large nonlinear effects for ...

Abstract Most cementitious repair materials have non-ignorable drawbacks such as low strength, insufficient bonding, and anti-permeability. Although the bonding anti-permeability of mortars modified by polymer will be substantially improved, compressive strength component integrity decreased. Hereby six groups cement varied dosages Graphene Oxide (GO) PA copolymer (GOPARMs) were prepared. The f...